Unity prefab.SendMessage()和prefab.BroadcastMessage()

使用BroadcastMessage。它会将消息发送到所有包含的对象。

SendMessage不会遍历层次结构

if (PlayerUiPrefab != null)
{
    GameObject _uiGo =  Instantiate(PlayerUiPrefab);
    _uiGo.SendMessage ("SetTarget", this, SendMessageOptions.RequireReceiver);
}